/*
Copyright (C) 2020 Kristian Duske

This file is part of TrenchBroom.

TrenchBroom is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

TrenchBroom is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with TrenchBroom. If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include "kd/reflection_decl.h"

#include <vector>

namespace tb::mdl
{
class BrushNode;
class BrushFace;

/**
 * A brush face handle represents a brush face and additionally gives access to its
 * containing brush node.
 *
 * Note that brush faces are volatile and may be deleted when a brush is modified. Care
 * must be taken to prevent stale brush face handles which reference non existing brush
 * faces.
 */
class BrushFaceHandle
{
private:
  BrushNode* m_node;
  size_t m_faceIndex;

public:
  /**
   * Creates a n brush face handle.
   *
   * @param node the containing brush node, must not be null
   * @param faceIndex the brush face index, must be valid for the given brush node
   */
  BrushFaceHandle(BrushNode* node, size_t faceIndex);

  /**
   * Returns the containing brush node.
   */
  BrushNode* node() const;

  /**
   * Returns the face index.
   */
  size_t faceIndex() const;

  /**
   * Returns the brush face.
   */
  const BrushFace& face() const;

  kdl_reflect_decl(BrushFaceHandle, m_node, m_faceIndex);
};

/**
 * Returns a vector containing the nodes contained in the given handles.
 */
std::vector<BrushNode*> toNodes(const std::vector<BrushFaceHandle>& handles);

/**
 * Returns a vector containing handles representing the faces of the given brush.
 */
std::vector<BrushFaceHandle> toHandles(BrushNode* brushNode);

} // namespace tb::mdl
